package com.itheima.controller;


import com.itheima.common.R;
import org.apache.commons.io.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;

    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        //原始文件吗
        String originalFilename = file.getOriginalFilename();

        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));//获取文件后缀名.jpg

        //使用UUID重新生成文件名,防止文件名称重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录对象
        File dir = new File(basePath);

        //判断当前目录是否存在
        if (!dir.exists()) {
            dir.mkdirs();
        }

        try {
            //将临时文件转存到指定位置
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        return R.success(fileName);

    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {

        try {
            //输出流 通过输入流读取文件内容
            FileInputStream fis = new FileInputStream(new File(basePath + name));

            //输出流 通过输出流将文件写回浏览器
            ServletOutputStream sos = response.getOutputStream();

            IOUtils.copy(fis,sos);//将输入流中数据 拷贝到输出流中

            fis.close();//关闭 资源

        } catch (Exception e) {
            e.printStackTrace();
        }


    }
}
